import { HTTP } from '../utils/http.js'
class ClassicModel extends HTTP {

  getLatest(sCallback) {
    this.request({
      url: 'classic/latest',
      success: (res) => {
        sCallback(res)
        this._setLatestIndex(res.index)
        let key = this._getKey(res.index)
        wx.setStorageSync(key, res)
      }
    })
  }

  getClassic(index, nextOrPrevious, sCallback) {
    let key = nextOrPrevious === "next"
      ? this._getKey(index + 1)
      : this._getKey(index - 1);
    
    let classic = wx.getStorageSync(key)
    if(!classic) {
      this.request({
        url: `classic/${index}/${nextOrPrevious}`,
        success: res => {
          wx.setStorageSync(this._getKey(res.index), res)
          sCallback(res)
        }
      })
    } else {
      sCallback(classic)
    }
  }

  isFirst(index) {
    return index === 1 ? true : false
  }

  isLatest(index) {
    let latestIndex = this._getLatestIndex();
    return latestIndex === index ? true : false;
  }

  getMyFavor(success) {
    const params = {
      url: 'classic/favor',
      success: success
    }
    this.request(params)
  }

  getById(cid, type, success) {
    let params = {
      url: `classic/${type}/${cid}`,
      success: success
    }
    this.request(params)
  }

  _setLatestIndex(index) {
    wx.setStorageSync('latest', index);
  }

  _getLatestIndex() {
    const index = wx.getStorageSync('latest')
    return index
  }

  _getKey(index) {
    return `classic-${index}`
  }

}

export { ClassicModel }

